OK, let's work through this together. We're starting with 368 and we're going to multiply it by 15, which means we add 368 to itself 15 times.
Step 1: 0 + 368 = 368
Step 2: 368 + 368 = 736
Step 3: 736 + 368 = 1104
Step 4: 1104 + 368 = 1472
Step 5: 1472 + 368 = 1840
Step 6: 1840 + 368 = 2208
Step 7: 2208 + 368 = 2576
Step 8: 2576 + 368 = 2944
Step 9: 2944 + 368 = 3312
Step 10: 3312 + 368 = 3680
Step 11: 3680 + 368 = 4048
Step 12: 4048 + 368 = 4416
Step 13: 4416 + 368 = 4784
Step 14: 4784 + 368 = 5152
Step 15: 5152 + 368 = 5520

So, 368*15 = 5520